Make NSSCertDatabase::ListCerts work async on a worker thread.

chrome/browser/certificate_manager_model.cc

Index: chrome/browser/certificate_manager_model.cc
diff --git a/chrome/browser/certificate_manager_model.cc b/chrome/browser/certificate_manager_model.cc
index b8b43faed186f0dbd80c1094ab96fdd459bc29b1..d1f8fec6bbe058609a35108fb886ae75b0de8a6b 100644
--- a/chrome/browser/certificate_manager_model.cc
+++ b/chrome/browser/certificate_manager_model.cc
@@ -78,7 +78,7 @@ CertificateManagerModel::~CertificateManagerModel() {
 void CertificateManagerModel::Refresh() {
   DVLOG(1) << "refresh started";
   net::CryptoModuleList modules;
-  cert_db_->ListModules(&modules, false);
+  cert_db_->ListModulesSync(&modules, false);
   DVLOG(1) << "refresh waiting for unlocking...";
   chrome::UnlockSlotsIfNecessary(
       modules,
@@ -91,7 +91,7 @@ void CertificateManagerModel::Refresh() {
 
 void CertificateManagerModel::RefreshSlotsUnlocked() {
   DVLOG(1) << "refresh listing certs...";
-  cert_db_->ListCerts(&cert_list_);
+  cert_db_->ListCertsSync(&cert_list_);
   observer_->CertificatesRefreshed();
   DVLOG(1) << "refresh finished";
 }